ofnet.c revision 1.22 
1/*	$NetBSD: ofnet.c,v 1.22 2001/10/20 08:19:47 billc Exp $	*/
2
3/*
4 * Copyright (C) 1995, 1996 Wolfgang Solfrank.
5 * Copyright (C) 1995, 1996 TooLs GmbH.
6 * All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 *    notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 * 3. All advertising materials mentioning features or use of this software
17 *    must display the following acknowledgement:
18 *	This product includes software developed by TooLs GmbH.
19 * 4. The name of TooLs GmbH may not be used to endorse or promote products
20 *    derived from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY TOOLS GMBH ``AS IS'' AND ANY EXPRESS OR
23 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
24 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
25 * IN NO EVENT SHALL TOOLS GMBH BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
26 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
27 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
28 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
29 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
30 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
31 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
32 */
33#include "ofnet.h"
34#include "opt_inet.h"
35#include "bpfilter.h"
36
37#include <sys/param.h>
38#include <sys/systm.h>
39#include <sys/callout.h>
40#include <sys/device.h>
41#include <sys/disk.h>
42#include <sys/ioctl.h>
43#include <sys/mbuf.h>
44#include <sys/socket.h>
45#include <sys/syslog.h>
46
47#include <net/if.h>
48#include <net/if_ether.h>
49
50#ifdef INET
51#include <netinet/in.h>
52#include <netinet/if_inarp.h>
53#endif
54
55#if NBPFILTER > 0
56#include <net/bpf.h>
57#include <net/bpfdesc.h>
58#endif
59
60#include <dev/ofw/openfirm.h>
61
62#if NIPKDB_OFN > 0
63#include <ipkdb/ipkdb.h>
64#include <machine/ipkdb.h>
65
66struct cfattach ipkdb_ofn_ca = {
67	0, ipkdb_probe, ipkdb_attach
68};
69
70static struct ipkdb_if *kifp;
71static struct ofnet_softc *ipkdb_of;
72
73static int ipkdbprobe (struct cfdata *, void *);
74#endif
75
76struct ofnet_softc {
77	struct device sc_dev;
78	int sc_phandle;
79	int sc_ihandle;
80	struct ethercom sc_ethercom;
81	struct callout sc_callout;
82};
83
84static int ofnet_match (struct device *, struct cfdata *, void *);
85static void ofnet_attach (struct device *, struct device *, void *);
86
87struct cfattach ofnet_ca = {
88	sizeof(struct ofnet_softc), ofnet_match, ofnet_attach
89};
90
91static void ofnet_read (struct ofnet_softc *);
92static void ofnet_timer (void *);
93static void ofnet_init (struct ofnet_softc *);
94static void ofnet_stop (struct ofnet_softc *);
95
96static void ofnet_start (struct ifnet *);
97static int ofnet_ioctl (struct ifnet *, u_long, caddr_t);
98static void ofnet_watchdog (struct ifnet *);
99
100static int
101ofnet_match(struct device *parent, struct cfdata *match, void *aux)
102{
103	struct ofbus_attach_args *oba = aux;
104	char type[32];
105	int l;
106
107#if NIPKDB_OFN > 0
108	if (!parent)
109		return ipkdbprobe(match, aux);
110#endif
111	if (strcmp(oba->oba_busname, "ofw"))
112		return (0);
113	if ((l = OF_getprop(oba->oba_phandle, "device_type", type,
114	    sizeof type - 1)) < 0)
115		return 0;
116	if (l >= sizeof type)
117		return 0;
118	type[l] = 0;
119	if (strcmp(type, "network"))
120		return 0;
121	return 1;
122}
123
124static void
125ofnet_attach(struct device *parent, struct device *self, void *aux)
126{
127	struct ofnet_softc *of = (void *)self;
128	struct ifnet *ifp = &of->sc_ethercom.ec_if;
129	struct ofbus_attach_args *oba = aux;
130	char path[256];
131	int l;
132	u_int8_t myaddr[ETHER_ADDR_LEN];
133
134	of->sc_phandle = oba->oba_phandle;
135#if NIPKDB_OFN > 0
136	if (kifp &&
137	    kifp->unit - 1 == of->sc_dev.dv_unit &&
138	    OF_instance_to_package(kifp->port) == oba->oba_phandle)  {
139		ipkdb_of = of;
140		of->sc_ihandle = kifp->port;
141	} else
142#endif
143	if ((l = OF_package_to_path(oba->oba_phandle, path,
144	    sizeof path - 1)) < 0 ||
145	    l >= sizeof path ||
146	    (path[l] = 0, !(of->sc_ihandle = OF_open(path))))
147		panic("ofnet_attach: unable to open");
148	if (OF_getprop(oba->oba_phandle, "mac-address", myaddr,
149	    sizeof myaddr) < 0)
150		panic("ofnet_attach: no mac-address");
151	printf(": address %s\n", ether_sprintf(myaddr));
152
153	callout_init(&of->sc_callout);
154
155	bcopy(of->sc_dev.dv_xname, ifp->if_xname, IFNAMSIZ);
156	ifp->if_softc = of;
157	ifp->if_start = ofnet_start;
158	ifp->if_ioctl = ofnet_ioctl;
159	ifp->if_watchdog = ofnet_watchdog;
160	ifp->if_flags = IFF_BROADCAST | IFF_SIMPLEX | IFF_NOTRAILERS;
161
162	if_attach(ifp);
163	ether_ifattach(ifp, myaddr);
164
165#ifdef __BROKEN_DK_ESTABLISH
166	dk_establish(0, self);					/* XXX */
167#endif
168}
169
170static char buf[ETHERMTU + sizeof(struct ether_header)];
171
172static void
173ofnet_read(struct ofnet_softc *of)
174{
175	struct ifnet *ifp = &of->sc_ethercom.ec_if;
176	struct mbuf *m, **mp, *head;
177	int l, len;
178	char *bufp;
179
180#if NIPKDB_OFN > 0
181	ipkdbrint(kifp, ifp);
182#endif
183	while (1) {
184		if ((len = OF_read(of->sc_ihandle, buf, sizeof buf)) < 0) {
185			if (len == -2 || len == 0)
186				return;
187			ifp->if_ierrors++;
188			continue;
189		}
190		if (len < sizeof(struct ether_header)) {
191			ifp->if_ierrors++;
192			continue;
193		}
194		bufp = buf;
195
196		/* Allocate a header mbuf */
197		MGETHDR(m, M_DONTWAIT, MT_DATA);
198		if (m == 0) {
199			ifp->if_ierrors++;
200			continue;
201		}
202		m->m_pkthdr.rcvif = ifp;
203		m->m_pkthdr.len = len;
204
205		/*
206		 * We don't know if the interface included the FCS
207		 * or not.  For now, assume that it did if we got
208		 * a packet length that looks like it could include
209		 * the FCS.
210 		 *
211		 * XXX Yuck.
212		 */
213
214		if (len > (ETHER_MAX_LEN - ETHER_CRC_LEN))
215			m->m_flags |= M_HASFCS;
216
217		l = MHLEN;
218		head = 0;
219		mp = &head;
220
221		while (len > 0) {
222			if (head) {
223				MGET(m, M_DONTWAIT, MT_DATA);
224				if (m == 0) {
225					ifp->if_ierrors++;
226					m_freem(head);
227					head = 0;
228					break;
229				}
230				l = MLEN;
231			}
232			if (len >= MINCLSIZE) {
233				MCLGET(m, M_DONTWAIT);
234				if ((m->m_flags & M_EXT) == 0) {
235					ifp->if_ierrors++;
236					m_free(m);
237					m_freem(head);
238					head = 0;
239					break;
240				}
241				l = MCLBYTES;
242			}
243
244			/*
245			 * Make sure the data after the Ethernet header
246			 * is aligned.
247			 *
248			 * XXX Assumes the device is an ethernet, but
249			 * XXX then so does other code in this driver.
250			 */
251			if (head == NULL) {
252				caddr_t newdata = (caddr_t)ALIGN(m->m_data +
253				      sizeof(struct ether_header)) -
254				    sizeof(struct ether_header);
255				l -= newdata - m->m_data;
256				m->m_data = newdata;
257			}
258
259			m->m_len = l = min(len, l);
260			bcopy(bufp, mtod(m, char *), l);
261			bufp += l;
262			len -= l;
263			*mp = m;
264			mp = &m->m_next;
265		}
266		if (head == 0)
267			continue;
268
269#if NBPFILTER > 0
270		if (ifp->if_bpf)
271			bpf_mtap(ifp->if_bpf, m);
272#endif
273		ifp->if_ipackets++;
274		(*ifp->if_input)(ifp, head);
275	}
276}
277
278static void
279ofnet_timer(arg)
280	void *arg;
281{
282	struct ofnet_softc *of = arg;
283
284	ofnet_read(of);
285	callout_reset(&of->sc_callout, 1, ofnet_timer, of);
286}
287
288static void
289ofnet_init(struct ofnet_softc *of)
290{
291	struct ifnet *ifp = &of->sc_ethercom.ec_if;
292
293	if (ifp->if_flags & IFF_RUNNING)
294		return;
295
296	ifp->if_flags |= IFF_RUNNING;
297	/* Start reading from interface */
298	ofnet_timer(of);
299	/* Attempt to start output */
300	ofnet_start(ifp);
301}
302
303static void
304ofnet_stop(struct ofnet_softc *of)
305{
306	callout_stop(&of->sc_callout);
307	of->sc_ethercom.ec_if.if_flags &= ~IFF_RUNNING;
308}
309
310static void
311ofnet_start(struct ifnet *ifp)
312{
313	struct ofnet_softc *of = ifp->if_softc;
314	struct mbuf *m, *m0;
315	char *bufp;
316	int len;
317
318	if (!(ifp->if_flags & IFF_RUNNING))
319		return;
320
321	for (;;) {
322		/* First try reading any packets */
323		ofnet_read(of);
324
325		/* Now get the first packet on the queue */
326		IF_DEQUEUE(&ifp->if_snd, m0);
327		if (!m0)
328			return;
329
330		if (!(m0->m_flags & M_PKTHDR))
331			panic("ofnet_start: no header mbuf");
332		len = m0->m_pkthdr.len;
333
334#if NBPFILTER > 0
335		if (ifp->if_bpf)
336			bpf_mtap(ifp->if_bpf, m0);
337#endif
338
339		if (len > ETHERMTU + sizeof(struct ether_header)) {
340			/* packet too large, toss it */
341			ifp->if_oerrors++;
342			m_freem(m0);
343			continue;
344		}
345
346		for (bufp = buf; (m = m0) != NULL;) {
347			bcopy(mtod(m, char *), bufp, m->m_len);
348			bufp += m->m_len;
349			MFREE(m, m0);
350		}
351
352		/*
353		 * We don't know if the interface will auto-pad for
354		 * us, so make sure it's at least as large as a
355		 * minimum size Ethernet packet.
356		 */
357
358		if (len < (ETHER_MIN_LEN - ETHER_CRC_LEN))
359			len = ETHER_MIN_LEN - ETHER_CRC_LEN;
360		else
361			len = bufp - buf;
362
363		if (OF_write(of->sc_ihandle, buf, len) != len)
364			ifp->if_oerrors++;
365		else
366			ifp->if_opackets++;
367	}
368}
369
370static int
371ofnet_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
372{
373	struct ofnet_softc *of = ifp->if_softc;
374	struct ifaddr *ifa = (struct ifaddr *)data;
375	/* struct ifreq *ifr = (struct ifreq *)data; */
376	int error = 0;
377
378	switch (cmd) {
379	case SIOCSIFADDR:
380		ifp->if_flags |= IFF_UP;
381
382		switch (ifa->ifa_addr->sa_family) {
383#ifdef	INET
384		case AF_INET:
385			arp_ifinit(ifp, ifa);
386			break;
387#endif
388		default:
389			break;
390		}
391		ofnet_init(of);
392		break;
393	case SIOCSIFFLAGS:
394		if ((ifp->if_flags & IFF_UP) == 0 &&
395		    (ifp->if_flags & IFF_RUNNING) != 0) {
396			/* If interface is down, but running, stop it. */
397			ofnet_stop(of);
398		} else if ((ifp->if_flags & IFF_UP) != 0 &&
399			   (ifp->if_flags & IFF_RUNNING) == 0) {
400			/* If interface is up, but not running, start it. */
401			ofnet_init(of);
402		} else {
403			/* Other flags are ignored. */
404		}
405		break;
406	default:
407		error = EINVAL;
408		break;
409	}
410	return error;
411}
412
413static void
414ofnet_watchdog(struct ifnet *ifp)
415{
416	struct ofnet_softc *of = ifp->if_softc;
417
418	log(LOG_ERR, "%s: device timeout\n", of->sc_dev.dv_xname);
419	ifp->if_oerrors++;
420	ofnet_stop(of);
421	ofnet_init(of);
422}
423
424#if NIPKDB_OFN > 0
425static void
426ipkdbofstart(struct ipkdb_if *kip)
427{
428	int unit = kip->unit - 1;
429
430	if (ipkdb_of)
431		ipkdbattach(kip, &ipkdb_of->sc_ethercom);
432}
433
434static void
435ipkdbofleave(struct ipkdb_if *kip)
436{
437}
438
439static int
440ipkdbofrcv(struct ipkdb_if *kip, u_char *buf, int poll)
441{
442	int l;
443
444	do {
445		l = OF_read(kip->port, buf, ETHERMTU);
446		if (l < 0)
447			l = 0;
448	} while (!poll && !l);
449	return l;
450}
451
452static void
453ipkdbofsend(struct ipkdb_if *kip, u_char *buf, int l)
454{
455	OF_write(kip->port, buf, l);
456}
457
458static int
459ipkdbprobe(struct cfdata *match, void *aux)
460{
461	struct ipkdb_if *kip = aux;
462	static char name[256];
463	int len;
464	int phandle;
465
466	kip->unit = match->cf_unit + 1;
467
468	if (!(kip->port = OF_open("net")))
469		return -1;
470	if ((len = OF_instance_to_path(kip->port, name, sizeof name - 1)) < 0 ||
471	    len >= sizeof name)
472		return -1;
473	name[len] = 0;
474	if ((phandle = OF_instance_to_package(kip->port)) == -1)
475		return -1;
476	if (OF_getprop(phandle, "mac-address", kip->myenetaddr,
477	    sizeof kip->myenetaddr) < 0)
478		return -1;
479
480	kip->flags |= IPKDB_MYHW;
481	kip->name = name;
482	kip->start = ipkdbofstart;
483	kip->leave = ipkdbofleave;
484	kip->receive = ipkdbofrcv;
485	kip->send = ipkdbofsend;
486
487	kifp = kip;
488
489	return 0;
490}
491#endif
492